tolong bantu jawab ya

9.
3/5 × 5/6 + 4/5 - 9/10 : 3/4
=15/30 + 4/5 - 9/10 × 4/3
=15/30 + 4/5 - 36/30
=15/30 + 24/30 - 36/30
=3/30
=1/10

10.
2 / 3 - 1/5
=2/1 / 15/5 - 1/5
=2/1 / 14/5
=2/1 : 14/5
=2/1 × 5/14
=10/14
=5/7

11.
3/4 + 1 / 2/5 + 2
=3/4 + 4/4 / 2/5 + 10/5
=7/4 / 12/5
=7/4 : 12/5
=7/4 × 5/12
=35/48

Semoga bisa membantu...